Molding-machine.



G. L. GRIMES.

MOLDING MACHINE.

APPLIGATION FILED 0011.14, 1912.

Patented Mar. 9, 1915.

3 $HEETS$HEET 1- I Snow 1 oz G. L. GRIMYS.

MOLDING MACHINE.

APPLICATION FILED 0011.14. 1912.

Patented Mar. 9, 1915.

3 $HEETS-SHEET 2.

G. L. GRIMES.

MOLDING MACHINE. APPLICATION IILED 0013.14, 1912.

1 130 968. Patented M119, 1915. I, s SHEETS-SHEET 3.

GEORGE L. GRIMES, OF DETROIT, MICHIGAN.

MOLDIN G-MACHIN E.

Specification of Letters Patent.

Patented Mar. 9, 1915.

Application filed October 14, 1912. Serial No. 725,572.

To all whom it may concern Be it known that I, GEORGE L. GRIMEs, citizenof the United States, residing at Detroit, county of Wayne, State ofMichigan, have invented a certain new and useful Improvement inMolding-Machines, and declare the following to be a full, clear, andexact description of the same, such as will enable others skilled in theart to which it pertains to make and use the same, reference being hadto the accompanying drawings, which form a part of this specification.

My invention relates to an improvement in molding machines, particularlyto that class of molding machines in which air pressure is employed tovibrate the mold for the purpose of ramming the sand, as shown in t eaccompanying drawings, reference being bad to the followingspecification and claims.

One of the objects of the invention is to provide means whereby theboard covering the flask may be clamped thereto under air pressure prearatory to reversing the flask.

Another 0 ject is to compress the sand in the mold by means of the airpressure.

Other advantages and improvements will hereafter appear.

In the drawings accompanying this speci- 4 is a side elevation of themachine with parts broken away, showing in dotted lines the platformelevated and a flask in position. Fig. 5 is a longitudinal verticalsectionthrough the machine. Fig. 6 is a crosssectional View of themachine. Fig. 7 1s a horizontal section on line 44 of Fig, 4 lookingtoward the base.

eferrmg now to the letters of reference placed upon the drawings :Adenotes a suitable base plate, and A the standard rising from the baseprovided at its top with a hub or bearing A to receive the annulartrunnion B, of the revolving head B.

C is a cylinder supported in the end ofthe head B having afiangedfportion O secured to the head by bolts 0. ojecting throughperforations provided in the H anged portion are guide rods D, the lowerends of which engage a platform E. on which the flask F 1s mounted.

are swinging arms pivoted to the respectlve guide rods D, the flangedportion C pro ecting between the bifurcated port'ions 9 thereof.

g are adjustable bolts supported in the swinging arms designed to bboard F carrying the flask.

' F 2 is a follow board to which the pattern (not shown) is secured.

is a pipe leading from a compressed air tank (not shown) under controlof a valve H.

I is a four way cock having the usual inlet and exhaust ports.

is a flexible hose connection leading from the four way cock through theannular trunnion B to the lower end of the cylinder C. J is a similarconnection from the four way cock to the cylinder connectin with theport 7 in turn opening into the upper end of the cylinder.

is a pipe leading from the exhaust port is under control of a valve Ix Eis a piston housed within the cylinder a suitable stufiing box L ;-thelower end of the piston rod being secured to the platform E.

M is a manually operated lever pivoted at m to the standard its lowerend bein engaged with a spring actuated bolt N housed in the standarbeing in turn adapt ed to project into the opening N, provided in therevolving head B, whereby the head may be locked against rotation whenin its adjusted position.

0, denote adjustable cages carrying anti-friction rolls designed to bearagainst the guide rods D.

are screw-threaded bolts projecting through the wall of the revolvinghead and bearing against the cages O to force the rolils into impingingcontact with the guide r0 5. v

P is a friction roll supported in a suitable ear upon the C, itsprojecting rod L extending through is a stop lug projecting from theback 11' F covering the of the revolving head adapted to contact withthe standard A to limit the rotation of the head.

Having indicated the several parts by reference letters, theconstruction and operation of the machine will be readily understood.

The machine is first brought to the position indicated in Fig.1;-the'follow board with the pattern secured thereto is then mountedupon the platform E with a flask properly adjusted and held againstdisplacement in the usual manner. Sand is now placed within the flaskand air-under essureadinitted to the cylinder below the piston L, by theadjustment of the valve H and the four way cock I;whereupon the pistonwill be forced upward carrying with it the platform E- on which theflask is mounted. Upon the piston uncovering the port is the air willexhaust through the pipe K permitting the platform E with its flask todrop by gravity causing the sand to pack around the pattern. Thisoperation is repeated again and again until the mold is formed. When themold is completely formed the board F is placed upon the flask, theswinging arms G adjusted in position over the flask, and air againadmitted through the pipe J into the bottom of the cylinder, forcing theplatform upward carrying with it the flask as before. The exhaust portIt, however, is now closed by the valve K, the piston continuestherefore to move upward after uncovering the exhaust port until theboard 1? of the flask is brought into contact with the depending bolts9' of the swinging arms G. These bolts are then adjusted so as to insurea perfect contact between at all points. It will now be obvious thatupon a further admission of air under suitable pressure to the cylinder,the platform E with its flask will be forced upward compressing the sandin the flask. The board flask being now held in (position by thepressure of air in the cylin er, the lever M is operated releasing thespring actuated bolt N from looking engagement with the revolving headB; the latter may then be rotated to the reversed position indicated inFig. 2. The spring bolt N, when the board and the mold released by thecontrolling lever M, will return into locking engagement with therevolving head, thereby securing the latter against displacement. Thefour way cock I is next adjusted to exhaust the air through the port Jwhich is now at the top of the cylinder and to admit air through the pio J into the port y' at the opposite end of t e cylinder, forcing theplatform E upward thereby lifting the follow board and pattern from theflask. Upon removing the flask, the platform E may be returned to itsinitial position ready for the formation of a new mold.

Having thus I claim is 1. In a" molding machine, a revolving frame, acylinder supported by the frame a flask carrying platform supported in te frame, a sliding piston in the cylinder connected with the flaskcarrying platform, swinging projecting arms carried by the frame adaptedto bear upon the cover of the flask, means for conveying air into thecylinder, a valve for controlling the delivery of air under pressure tothe cylinder to lift the platform, an exhaust port to release the airfrom the cylinder following the lifting of the platform whereby avibratory motion may be imparted to the flask, a valve for controllingthe discharge of airthrough the exhaust port whereby the sand in theflask may be compressed and the cover plate of the flask held inposition when brought into contact with the projecting arms adapted tobear upon saidcover plate, and locking means for securing the revolvingframe in.

its adjusted position.

'2. Apparatus prising a flask holder mounted on a trunnion bearing andwith a pressure head cooperative therewith, means for holding the flaskspressed against said pressure head as they are inverted and means foreffecting a preliminary jolting of the flask holder.

In testimony whereof, I sign this specification in the presence of twowitnesses.

GEORGE L. GRIMES.

Witnesses:

GRAon E. WYNKoor, SAMUEL E. THOMAS.

described my invention, what" of the kind described, com-

